CN1875208A - Ball screw device - Google Patents
Ball screw device Download PDFInfo
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- CN1875208A CN1875208A CN 200480031642 CN200480031642A CN1875208A CN 1875208 A CN1875208 A CN 1875208A CN 200480031642 CN200480031642 CN 200480031642 CN 200480031642 A CN200480031642 A CN 200480031642A CN 1875208 A CN1875208 A CN 1875208A
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- pressing member
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Abstract
A ball screw device, comprising a screw shaft having a first spiral screw groove in the outer peripheral surface thereof, a nut having, on the inner peripheral surface thereof, a second spiral screw groove corresponding to the first screw groove, threaded to the screw shaft, and having a pair of circulation holes in the side faces thereof, a large number of rolling elements rollingly charged in a load area formed between the first and second screw grooves, and a circulation part in which a rolling element circulation route for leading the rolling elements rolling in the load area from one of the pair of circulation holes to the outside of the nut and returning the roller elements from the other of the pair of circulation holes to the load area is formed therein and in which both end parts are fitted to the pair of circulation holes. The circulation part is made of a resin, and fixed to the nut by using a metal retaining tool.
Description
Technical field
For example the present invention relates to the ball-screw apparatus that in various industrial machineries etc., uses.
Background technique
As existing this ball-screw apparatus, having of knowing is for example shown in Figure 29.This ball-screw apparatus 1 has at outer circumferential face and is combined with the nut 6 that inner peripheral surface has the shape of threads thread groove 4 corresponding with thread groove 2 on the lead screw shaft 3 of shape of threads thread groove 2.
The thread groove 4 of nut 6 is relative mutually with the thread groove of lead screw shaft 32, and between forms the screw-shaped load area, and being filled with a plurality of balls 5 as rotor in this load area can rotate.Utilize the rotation nut 6 (or lead screw shaft 3) of lead screw shaft 3 (or nut 6) then to move in the axial direction by the rotation of ball 5.
The part of nut 6 sides is made into tabular surface, on this tabular surface, be formed with two one group the circulation port 7 of crossing over lead screw shaft 3 and between two thread grooves 2,4, being communicated with, form ball circulation paths by the two ends that roughly are the circulation part 8 of コ word shape tubulose being embedded in this one group of circulation port 7, the circulation port 7 of the ball 5 that this ball circulation paths makes revolution along the load area between two thread grooves 2,4 from a side promotes and to the outside of nut 6, and in the described load area that returns from the circulation port 7 of opposite side.
For on the tabular surface that circulation part 8 is fixed on nut 6 and use as shown in Figure 30 pressing member 9.This pressing member 9 is by the cheap and mass-produced metal punching manufacturing of energy, as Figure 31～shown in Figure 33, nut 6 on axially below the long metallic sheet material substantial middle place be formed with along the axioversion of this circulation part 8 and embed the slot part 9a that circulation part 8 is used to push this circulation part 8.Be formed with lip part 9b in the both sides of slot part 9a, on this lip part 9b, be formed with screwing through hole 9c.
But this tubular type circulation part is owing to be that side surface direction from nut is left ball fully but can be become the outer loop mode of multiple rowization from the thread groove of nut, so be particularly suitable for the high capacity capacityization of little helical pitch part, but high rotating speedization along with nearest ball-screw apparatus, when ball accelerates to the collision speed of circulation part and crash energy when becoming big, then circulate part and thread groove (two shoulders that comprise thread groove) breakage and hinder speed up, therefore have motion that the direction of improvement of ball on the circulation part is tilted in the tangent direction of lead screw shaft and in the angle of lead direction.
But as in this wise ball to the tangent direction of lead screw shaft and be to promote on the angle of lead direction of thread groove, the shape of part of then circulating complicates (be not simple コ font but Z-shaped), and the circulation port of being opened on the nut tabular surface is the two end part that simple counterbore just can not embed this circulation part.
So existing is to take being formed on big or (tangentially) processing or the like the method that tilts of circulation hole drill on the nut tabular surface (for example with reference to real open clear 63-132156 communique).
In above-mentioned existing circulation tubular type ball-screw apparatus, for example in the installation of ball-screw apparatus, have error, or and in the moment load purposes big to the ball-screw apparatus effect by the machinery that ball-screw apparatus is installed self rigidity deficiency etc., since the revolution speed of ball 5 with the difference at position, place different and sometimes ball 5 be blocked in the circulation part 8 power that ball 5 handlebar circulation parts 8 upwards push away.When having this masterpiece to be used on the circulation part 8, seating plane (lip part 9b) easy deformation of utilizing the pressing member 9 of metal punching processing and fabricating to contact with the tabular surface of nut 6, the part 8 that might circulate floats.
As preventing that this circulation part 8 from floating the countermeasure of coming, be to use the pressing member of making by cutting rolled steel requiring pressing member to have in the purposes of intensity, but because this pressing member is that machining is made one by one, so just produce the high problem of processing cost.
And described reality is opened in the disclosed ball-screw apparatus of clear 63-132156 communique, the processed complex of the circulation port that on the nut tabular surface, forms, and because this circulation port is big, so the problem that has the thread groove of circulation port and adjacency to interfere the thread groove of or many such fine pitches of screw thread little concerning helical pitch.
In view of this problem, also there is the ball-screw apparatus of motion can easily be implemented in the tangent direction of lead screw shaft and on the angle of lead direction, in the lifting ball, possess the also adaptable circulation part of thread groove of or many screw thread such fine pitches little for helical pitch.
The circulation part of this ball-screw apparatus is a synthetic resin system, has the foot that is entrenched in the nut circulation port at two end part, and rotor path that promotes and the path that returns are formed obliquely in each foot for the outer circumferential face of described foot separately.
As the method that the circulation part is fixed on the nut, motion is for example arranged: directly be fixed on the nut by screw etc. to the circulation part, or by the elastic ring of ring-type circulation part elasticity is pushed and to be fixed on the nut, or form projection and by this projection being hung over method such as fix on the nut side in the foot of circulation part.
But the circulation part directly is fixed in the method on the nut by screw etc., might be produced creep strain and the fastening of screw fluffed by the seating plane of the resin system of screw circulation part.
Elastic ring by ring-type is pushed circulation part elasticity in the method that is fixed on the nut, although floating a little by the circulation part, expectation makes the elongated bad effect of circulation of eliminating of circulating path total length when the generation ball-recirculation is bad, but, bring bad influence then might for the circulation of ball by floating of the bad caused circulation part of ball-recirculation if excessive.
In addition, form projection and by this projection being hung in the method for fixing on the nut side in the foot of circulation part, for circulation part when the generation ball-recirculation is bad floats and does not come off, just the projection manufacturing that need form the foot at the circulation part is big, if this projection greatly then is difficult to the foot of circulation part is embedded in the circulation port, problem is arranged on assembling performance.
Summary of the invention
The present invention develops in order to eliminate this bad situation, purpose provides a kind of ball-screw apparatus, when it can reliably and easily be fixed on the circulation part on the nut, can prevent that rotor from floating in that the circulation part of circulation when bad takes place, and the cost degradation of the part of seeking to circulate.
In order to reach described purpose, ball-screw apparatus provided by the invention comprises: lead screw shaft, and it has screw-shaped first thread groove at outer circumferential face; Nut, it has screw-shaped second thread groove corresponding with described first thread groove and screws on described lead screw shaft at inner peripheral surface, and has a pair of circulation port in its side; A plurality of rotors, it is seated in the load area that forms between described first and second thread grooves and can rotates; Peucinous circulation part, it is formed with in inside the described rotor that rotates in the described load area side directed outside to this nut in the described a pair of circulation port, and the opposite side in the described a pair of circulation port turns back to the rotor circulating path of described load area, and its two end part are entrenched in the described a pair of circulation port; The metallic pressing member, its described circulation part is fixed on the described nut.
Best described pressing member is by the metal punching processing and fabricating.
Best described pressing member is made by stretch process.
Best described circulation part exposes being covered by described pressing member more than or equal to 60% of part from described nut side.
Best described pressing member is provided with stiffening rib.
The part of best described pressing member curved section is provided with protuberance.
Best described circulation part has the foot that is entrenched in the described circulation port at two end part, and described rotor path that promotes and the path that returns are formed obliquely in each foot for the outer circumferential face of described foot separately.
Ball-screw apparatus provided by the invention comprises: lead screw shaft, and it has screw-shaped first thread groove at outer circumferential face; Nut, it has screw-shaped second thread groove corresponding with described first thread groove at inner peripheral surface, and it screws on described lead screw shaft, and has a pair of circulation port in its side; A plurality of rotors, it is seated in the load area that forms between described first and second thread grooves and can rotates; Peucinous circulation part, it is formed with in inside the described rotor that rotates in the described load area side directed outside to this nut in the described a pair of circulation port, and the opposite side in the described a pair of circulation port turns back to the rotor circulating path of described load area, and its two end part are entrenched in the described a pair of circulation port; The metallic pressing member, it is processed to form by metal punching, and its described circulation part is fixed on the described nut, and the described nut seating plane of described pressing member is provided with strengthens using curved part.
Best described circulation part has the foot that is entrenched in the described circulation port at two end part, and described rotor path that promotes and the path that returns are formed obliquely in each foot for the outer circumferential face of described foot separately.
Description of drawings
Fig. 1 is the explanatory drawing that is used to illustrate the ball-screw apparatus of first embodiment of the invention;
Fig. 2 is the figure that sees from arrow 2 directions of Fig. 1;
Fig. 3 is along the axial sectional drawing of Fig. 2;
Fig. 4 is the planimetric map of pressing member;
Fig. 5 is the figure that sees from arrow 5 directions of Fig. 4;
Fig. 6 is the figure that sees from arrow 6 directions of Fig. 4;
Fig. 7 is the planimetric map of expression pressing member first variation;
Fig. 8 is the figure that sees from arrow 8 directions of Fig. 7;
Fig. 9 is the figure that sees from arrow 9 directions of Fig. 7;
Figure 10 is the figure that is used to illustrate pressing member second variation;
Figure 11 is the figure that sees from arrow 11 directions of Figure 10;
Figure 12 is the stereogram of pressing member shown in Figure 10;
Figure 13 is the stereogram of seeing from Figure 12 below;
Figure 14 is the figure that is used to illustrate pressing member the 3rd variation;
Figure 15 is the figure that sees from arrow 14 directions of Figure 14;
Figure 16 is the planimetric map of pressing member shown in Figure 14;
Figure 17 is the figure that sees from arrow 17 directions of Figure 16;
Figure 18 is the figure that sees from arrow 18 directions of Figure 16;
Figure 19 is the stereogram of the 4th variation of expression pressing member;
Figure 20 is the stereogram of seeing from Figure 19 below;
Figure 21 is the stereogram of the 5th variation of expression pressing member;
Figure 22 is the figure that is used to illustrate the pressing member on the ball-screw apparatus that is installed in second embodiment of the invention;
Figure 23 is the figure that sees from arrow 23 directions of Figure 22;
Figure 24 is the figure that sees from arrow 24 directions of Figure 22;
Figure 25 is the figure that sees from arrow 25 directions of Figure 22;
Figure 26 is that the figure with the curved part variation is strengthened in expression;
Figure 27 is the figure that sees from arrow 27 directions of Figure 26;
Figure 28 is the figure that sees from arrow 28 directions of Figure 26;
Figure 29 is the sectional drawing that is used to illustrate existing ball-screw apparatus major component;
Figure 30 is the figure that expression is installed in existing pressing member state on the Circulation pipe;
Figure 31 is the figure of the existing pressing member of expression;
Figure 32 is the figure that sees from arrow 32 directions of Figure 31;
Figure 33 is the figure that sees from arrow 33 directions of Figure 31.
Embodiment
A following example with reference to the description of drawings embodiment of the invention.Fig. 1 is the explanatory drawing that is used to illustrate the first embodiment of the invention ball-screw apparatus, Fig. 2 is the figure that sees from arrow 2 directions of Fig. 1, Fig. 3 is along the axial sectional drawing of Fig. 2, Fig. 4 is the planimetric map of pressing member, Fig. 5 is the figure that sees from arrow 5 directions of Fig. 4, Fig. 6 is the figure that sees from arrow 6 directions of Fig. 4, and Fig. 7～Figure 21 is the figure that is used to illustrate the pressing member variation, and Figure 22～Figure 28 is used to illustrate the figure that is installed in the pressing member on the second embodiment of the invention ball-screw apparatus.
As Fig. 1～shown in Figure 3, first embodiment of the invention ball-screw apparatus 10, has the chimeric nut 14 that has inner peripheral surface to have the shape of threads thread groove 13 corresponding on the lead screw shaft 12 of shape of threads thread groove 11 with thread groove 11 at outer circumferential face, the thread groove 13 of nut 14 is relative mutually with the thread groove of lead screw shaft 12 11, and between forms the screw-shaped load area.
Being filled with a plurality of balls 15 as rotor in this load area can rotate, and utilizes the rotation nut 14 (or lead screw shaft 12) of lead screw shaft 12 (or nut 14) then to move in the axial direction by the rotation of ball 15.
Be formed with tabular surface on the part of nut 14 sides, the synthetic resin system circulation part 17 that for example is divided into two partition members vertically and is bonded with each other and constitutes is installed on this tabular surface.
Inside in each foot 19 of circulation part 17, be formed with to the roughly tangent direction of lead screw shaft 12 and with ball that the roughly consistent direction of the angle of lead of two thread grooves 11,13 is extended and promote or ball path 21, be formed with in the inside of body 17a each ball is promoted the ball path 22 that connects between the path 21.
By these each balls promote paths 21 and ball path 22 and circulation part 17 in the formation ball circulation paths, promote and be directed into the outside of nut 14 the side circulation port 20 of ball 15 in two one group circulation port 20 that this ball circulation paths is rotated the load area between described two thread grooves 11,13, and turn back in the described load area from the circulation port 20 of opposite side.
This circulation part 17 as with existing ball-screw apparatus shown in Figure 29 in the difference of the tubular type circulation part 8 that uses, be that a pair of foot 19 is embedded in the circulation port 20 that forms on nut 14 tabular surfaces simply almost very close to each otherly, can make the outer circumferential face inclination that promotes the relative foot 19 of direction of path 21 at foot's 19 inner balls that form simultaneously.
Therefore, can be as existing ball-screw apparatus on the tabular surface of nut 14 for lead screw shaft 12 machining cycle hole 20 on Vertical direction, and the foot 19 of circulation part 17 is embedded in this circulation port 20 simply, make simultaneously in foot 19 ball that forms promote path 21 ball 15 direct of travel to the roughly tangent direction of lead screw shaft 12 and with the roughly consistent direction inclination of the angle of lead of two thread grooves 11,13, like this, the processing of nut 14 is simple, and can seek to improve the lifting path of ball 15 and the design freedom of return path.
At this, this embodiment is embedded in the foot 19 of resin system circulation part 17 under the state in the circulation port 20 of nut 14, uses metal pressing member 30 that this circulation part 17 is fixed on the nut 14.
As Fig. 4～shown in Figure 6, this pressing member 30 is formed with the slot part 31 that forms along the axioversion of body 17a in the substantial middle place below the rectangular shape steel that nut 14 footpaths are upwards grown, this slot part 31 is to be used to embed the body 17a of circulation part 17 and to push this body 17a, is formed with screwing through hole 33 in the both sides of this slot part 31.
The body 17a of circulation part 17 is embedded in the slot part 31 of pressing member 30, with this state the screw 34 that is inserted in the screwing through hole 33 is tightened in the screw hole (not shown) that is arranged on nut 14 tabular surfaces, comes like this circulation part 17 is fixed on the nut 14.
Present embodiment is owing to be to use metal pressing member 30 that resinous circulation part 17 is fixed on the nut 14, so fastening fluff etc. that needn't worry that seating plane creep strain owing to resin system circulation part 17 makes screw 34, can reliably and easily be fixed on circulation part 17 on the nut 14, even and ball 15 circulations the floating of part 17 that also can prevent from when bad to circulate take place.
The following describes the variation of pressing member.
Fig. 7～Fig. 9 has represented first variation of pressing member, this pressing member 40 is the substantial middle place below the metallic sheet material that nut 14 footpaths are upwards grown, be formed with along the axioversion of body 17a by metal punching processing or sheet metal bending etc. and form slot part 41, this slot part 41 is to be used to embed the body 17a of circulation part 17 and to push this body 17a, be formed with lip part 42 in the both sides of this slot part 41, on this lip part 42, be formed with screwing through hole 43.
The body 17a of circulation part 17 is embedded in the slot part 41 of pressing member 40, with this state the screw 34 that is inserted in the screwing through hole 43 is tightened in the screw hole (not shown) that is arranged on nut 14 tabular surfaces, comes like this circulation part 17 is fixed on the nut 14.
Just can simple and low price ground making pressing member 40 by so metal sheet material being implemented metal punching processing or sheet metal bending etc.
Figure 10～Figure 13 has represented second variation of pressing member, the drawing and forming that this pressing member 50 is implemented stamping press to metallic sheet material is made, it comprises: circulation part 17 is exposed at roughly whole (being body 17a whole of circulation part 17 in this example) cap 51 that covers and the lip parts 52 that is separately positioned on cap 51 width both sides of the part of nut 14 sides, be formed with screwing through hole 53 on this lip part 52.
The body 17a of circulation part 17 is embedded in the cap 51 of pressing member 50, with this state the screw 34 that is inserted in the screwing through hole 53 is tightened in the screw hole (not shown) that is arranged on nut 14 tabular surfaces, like this circulation part 17 is fixed on the nut 14.
This structure is just in case when producing bad grade of ball 15 circulations, the seam of the part 17 that will circulate pushes away greatly even ball 15 pushes circulation part 17 internally, also because roughly Zone Full partes tegmentalis 51 coverings of circulation part 17, so can prevent that seam is opened.Because roughly all partes tegmentalis 51 coverings of circulation part 17 so can also block the sound of emitting to the outside through coming from the inside of circulation part 17, can reduce noise.
Figure 14～Figure 18 has represented the 3rd variation of pressing member, this pressing member 60 comprises: the part beyond the two end part of the body 17a of circulation part 17 cap 61 that covers and the lip part 62 that is separately positioned on cap 61 width both sides, be formed with screwing through hole 63 on this lip part 62.
The body 17a of circulation part 17 is embedded in the cap 61 of pressing member 60, with this state the screw 34 that is inserted in the screwing through hole 63 is tightened in the screw hole (not shown) that is arranged on nut 14 tabular surfaces, comes like this circulation part 17 is fixed on the nut 14.
Also can not the pressing member that roughly all covers shape of circulation part 17 as above-mentioned second variation, but be the pressing member that the part of circulation part 17 is exposed shape, but preferably circulation part 17 is exposed the pressing member more than or equal to 60% covering shape of part from nut 14 sides as this example.
The pressing member of this structure be owing to just can make simply by the sheet metal bending, so be not the such a large amount of productions of punch process but be suitable for a small amount of low-cost production, can certainly utilize punch process to produce in a large number.
Fig. 7～illustrated in fig. 18 can not negate the pressing member of sheet bending the generation possibility of following problem by some reason: taking place under the ball 15 circulation condition of poor, the ball 15 that is blocked on the circulating path is inferior the circulation part pushing situation that makes progress, because the plate bending of screwing through hole periphery and circulation part have and float.So also can and circulation part 17 part of pushing this circulation part 17 of joining and by screw nut 14 upper lateral parts divide between be provided with and strengthen using stiffening rib.This example is illustrated in Figure 19 and Figure 20 as the 4th variation.This example is on the pressing member 50 of the Figure 12 and second variation shown in Figure 13 stiffening rib to be set, be and circulation part 17 join and push the cap 51 of this circulation part 17 and between the lip part 52 on nut 14 sides, stiffening rib 70 is set by screw.
Replace stiffening rib also the protuberance of strengthening usefulness can be set on the part of sheet bending part.This example is illustrated in Figure 21 as the 5th variation.This example is on the part of pressing member 40 curved sections of first variation of Fig. 7～shown in Figure 180 protuberance 80 to be set.This structure utilizes punch process just can process protuberance simply, and makes pressing member have intensity, the floating of the part 17 that can prevent to circulate.
The present invention is not limited to described first embodiment and each variation, can carry out suitable change in the scope that does not break away from purport of the present invention.
Among for example described first embodiment as resinous circulation part, what adopt is foot 19 in two end part have the circulation port 20 that is entrenched in nut 14, the outer circumferential face of path 21 that rotor 15 is promoted and the relative respectively foot 19 of the path that returns is formed obliquely, but not necessarily being defined in this, is for example also can be useful in the present invention under the resinous condition on the pressing member of tubulose circulation part 8 of ball-screw apparatus shown in Figure 29 at the circulation part.
Be installed in the pressing member on the second embodiment of the invention ball-screw apparatus below with reference to Figure 22～Figure 28 explanation.Adopt the symbol of Figure 30 in the present embodiment, employing be the example of pressing member that tubular type circulation part (metallic or resin system) is fixed.
This pressing member 90 is by the metal punching processing and fabricating, as Figure 22～shown in Figure 24, at nut 6 substantial middle place below the long metallic sheet material on axially, be formed with the slot part 91 that is used to embed tubular type circulation part 8 and pushes this circulation part 8 along the axioversion of this circulation part 8.Be formed with lip part 92 in the both sides of slot part 91, on this lip part 92, be formed with screwing through hole 93.
At this, present embodiment is one-body molded on lip part 92 (seating plane) the width direction both sides of pressing member 90 with curved part 95 crooked obliquely upward reinforcement.
Present embodiment is fixed on circulation part 8 on the nut 6 by using the metallic pressing member 90 by the metal punching processing and fabricating, and nut 6 seating planes at pressing member 90, be to be provided with the curved part 95 of strengthening usefulness on the lip part 92, so the intensity of lip part 92 increases, also can prevent to circulate the floating of part 8 when bad even circulate at the body that rotates, and owing to be by the metal punching processing and fabricating, so can provide mass-produced pressing member with low cost.
The present invention is not limited to described second embodiment, can carry out suitable change in the scope that does not break away from purport of the present invention.
For example above-mentioned second embodiment adopted crooked obliquely upward reinforcement with curved part 95 one-body molded on lip part 92 (seating plane) width direction both sides the example of situation, but strengthen not being specially limited with the quantity or the curved shape of curved part, also can be for example as Figure 26～as shown in Figure 28, one-body molded on lip part 92 the reinforcement of raised line with curved part 96.
Above-mentioned second embodiment has adopted and has used a pressing member 90 to push the example of a circulation part situation, but also not necessarily must also can be to use a pressing member 90 to push the shape of a plurality of circulation parts like this.
Above-mentioned second embodiment has adopted the example of situation on the pressing member of tubulose circulation part 8 that the present invention is useful in, but what replace also can be useful in Fig. 1～foot 19 in two end part have the circulation port 20 that is entrenched in nut 14 shown in Figure 3 to the present invention, makes on the circulation part that in each foot 19 outer circumferential face of the path 21 of rotor 15 liftings and the relative respectively foot 19 of the path that returns is formed obliquely.
As above explanation, according to the first embodiment of the present invention, owing to be to use metal pressing member that resinous circulation part is fixed on the nut, so fastening fluff etc. that needn't worry that seating plane creep strain owing to resin system circulation part makes screw, can reliably and easily be fixed on the circulation part on the nut, even and the body that rotates circulate and also can prevent to circulate the floating of part when bad.
And the second embodiment of the present invention is fixed on the circulation part on the nut by using the metallic pressing member by the metal punching processing and fabricating, and on the nut seating plane of pressing member, be provided with the curved part of strengthening usefulness, so the intensity at the nut seating plane increases, also can prevent to circulate the floating of part when bad even circulate at the body that rotates, and owing to be by the metal punching processing and fabricating, so can provide mass-produced pressing member with low cost.
And in the first embodiment of the invention and second embodiment as the circulation part, the foot in two end part have the circulation port that is entrenched in nut that all is to use, make in each foot the path that rotor is promoted and the path that returns respectively the outer circumferential face of relative described foot be formed obliquely, can realize easily rotor to tangent direction and when being the lifting of angle of lead direction like this, can also be for helical pitch little or many such fine pitch thread grooves of screw thread adapt to, such ball-screw apparatus can be provided.
Describe the present invention in detail with reference to certain embodiments, but very clearly can carry out various distortion and correction without departing from the spirit and scope of the present invention for the industry.
The application is according to the Japanese patent application of Japanese patent application of on October 30th, 2003 application (the special 2003-370978 of hope) and application on January 30th, 2004 (special be willing to 2004-024617), and its content is taken in as reference at this.
Can be utilized in the ball-screw apparatus that the present invention for example uses in various industrial machineries etc.
Claims (9)
1, a kind of ball-screw apparatus wherein, comprising:
Lead screw shaft, it has screw-shaped first thread groove at outer circumferential face;
Nut, it has screw-shaped second thread groove corresponding with described first thread groove at inner peripheral surface, and it screws on described lead screw shaft, and has a pair of circulation port in its side;
A plurality of rotors, it is seated in the load area that forms between described first and second thread grooves and can rotates;
Peucinous circulation part, it is formed with in inside the described rotor that rotates in the described load area side directed outside to this nut in the described a pair of circulation port, and the opposite side in the described a pair of circulation port turns back to the rotor circulating path of described load area, and its two end part are entrenched in the described a pair of circulation port;
The metallic pressing member, its described circulation part is fixed on the described nut.
2, ball-screw apparatus as claimed in claim 1, wherein, described pressing member is by the metal punching processing and fabricating.
3, ball-screw apparatus as claimed in claim 2, wherein, described pressing member is made by stretch process.
4, ball-screw apparatus as claimed in claim 1, wherein, described circulation part exposes being covered by described pressing member more than or equal to 60% of part from described nut side.
5, ball-screw apparatus as claimed in claim 1, wherein, described pressing member is provided with stiffening rib.
6, ball-screw apparatus as claimed in claim 1, wherein, the part of described pressing member curved section is provided with protuberance.
7, ball-screw apparatus as claimed in claim 1, wherein, described circulation part has the foot that is entrenched in the described circulation port at two end part, and described rotor path that promotes and the path that returns are formed obliquely in each foot for the outer circumferential face of described foot separately.
8, a kind of ball-screw apparatus wherein, comprising:
Lead screw shaft, it has screw-shaped first thread groove at outer circumferential face;
Nut, it has screw-shaped second thread groove corresponding with described first thread groove at inner peripheral surface, and it screws on described lead screw shaft, and has a pair of circulation port in its side;
A plurality of rotors, it is seated in the load area that forms between described first and second thread grooves and can rotates;
Peucinous circulation part, it is formed with in inside the described rotor that rotates in the described load area side directed outside to this nut in the described a pair of circulation port, and the opposite side in the described a pair of circulation port turns back to the rotor circulating path of described load area, and its two end part are entrenched in the described a pair of circulation port;
The metallic pressing member, it is processed to form by metal punching, and its described circulation part is fixed on the described nut,
The described nut seating plane of described pressing member is provided with strengthens using curved part.
9, ball-screw apparatus as claimed in claim 8, wherein, described circulation part has the foot that is entrenched in the described circulation port at two end part, and described rotor path that promotes and the path that returns are formed obliquely in each foot for the outer circumferential face of described foot separately.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP370978/2003 | 2003-10-30 | ||
| JP2003370978 | 2003-10-30 | ||
| JP024617/2004 | 2004-01-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1875208A true CN1875208A (en) | 2006-12-06 |
Family
ID=37484923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200480031642 Pending CN1875208A (en) | 2003-10-30 | 2004-10-28 | Ball screw device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1875208A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101874167B (en) * | 2007-11-30 | 2014-01-08 | Thk株式会社 | Roller screw and circulation method of roller of roller screw |
| CN109715982A (en) * | 2016-10-07 | 2019-05-03 | 日本精工株式会社 | Circulation member pressing piece and ball-screw |
-
2004
- 2004-10-28 CN CN 200480031642 patent/CN1875208A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101874167B (en) * | 2007-11-30 | 2014-01-08 | Thk株式会社 | Roller screw and circulation method of roller of roller screw |
| CN109715982A (en) * | 2016-10-07 | 2019-05-03 | 日本精工株式会社 | Circulation member pressing piece and ball-screw |
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